Historical Marker
Toledos Canals
Historical marker location:
Toledo, Ohio
( Marker is at the intersection of Michigan Street and Jackson Street, on the left when traveling south on Michigan Street.)
Marker installed: 1987
Ohio Historical Marker.
The Great Serpent Mound, located in Adams County, Ohio, is a prehistoric effigy mound in the shape of a serpent that is more than 1,300 feet long. It is one of the largest effigy mounds in the world and is estimated to have been built by the Adena culture more than 1,000 years ago.